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The flux ratio of Fe XXVI--Ly$\alpha$ to Fe XXV--He$\alpha$ lines ($I_{\rm7.0}/I_{\rm 6.7}$) is a sensitive indicator of the maximum temperature ($T_{\rmmax}$), and therefore the mass of white dwarf stars ($M_{\rm WD}$) incataclysmic variables (CVs). To examine and calibrate the theoretical $I_{\rm7.0}/I_{\rm 6.7}$--$T_{\rm max}$--$M_{\rm WD}$ relations, reliable measurementsof $T_{\rm max}$ and $I_{\rm 7.0}/I_{\rm 6.7}$ are necessary. In this work, weconduct a thorough investigation on 3--50 keV X-ray spectra of 25 solarneighborhood magnetic and non-magnetic CVs based on archival \textit{NuSTAR}and \textit{Suzaku} observations. The measured $T_{\rm max}$ are compared tothe $I_{\rm 7.0}/I_{\rm 6.7}$ and $M_{\rm WD}$. The results show the sampledCVs closely follow the theoretical $I_{\rm 7.0}/I_{\rm 6.7}$--$T_{\rm max}$relation. Moreover, all the $M_{\rm WD}$ estimated from $I_{\rm 7.0}/I_{\rm6.7}$ are consistent with the dynamically measured ones. We conclude that$I_{\rm 7.0}/I_{\rm 6.7}$ can be used as a good diagnostic for $T_{\rm max}$and $M_{\rm WD}$ in both magnetic and non-magnetic CVs.

The Fe Line Flux Ratio as a diagnostic of the maximum temperature and the white dwarf mass of Cataclysmic Variables